Perform wudhu before calling adhaan.

This hadith, narrated by Abu Hurairah, teaches us that it is necessary to perform Wudu before calling the Adhan. The Adhan is a call made by a muezzin five times a day in order to announce that it is time for Muslims to pray. It serves as an invitation from Allah and must be done with purity and cleanliness. Therefore, one must perform Wudu before making this call in order to be spiritually prepared and connected with Allah. This hadith also emphasizes the importance of cleanliness in Islam as it shows how important it is even when performing religious duties such as calling the Adhan.